1 //===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines things specific to Unix implementations. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H 15 #define LLVM_LIB_SUPPORT_UNIX_UNIX_H 16 17 //===----------------------------------------------------------------------===// 18 //=== WARNING: Implementation here must contain only generic UNIX code that 19 //=== is guaranteed to work on all UNIX variants. 20 //===----------------------------------------------------------------------===// 21 22 #include "llvm/Config/config.h" // Get autoconf configuration settings 23 #include "llvm/Support/Chrono.h" 24 #include "llvm/Support/Errno.h" 25 #include <algorithm> 26 #include <assert.h> 27 #include <cerrno> 28 #include <cstdio> 29 #include <cstdlib> 30 #include <cstring> 31 #include <string> 32 #include <sys/types.h> 33 #include <sys/wait.h> 34 35 #ifdef HAVE_UNISTD_H 36 #include <unistd.h> 37 #endif 38 39 #ifdef HAVE_SYS_PARAM_H 40 #include <sys/param.h> 41 #endif 42 43 #ifdef HAVE_SYS_TIME_H 44 # include <sys/time.h> 45 #endif 46 #include <time.h> 47 48 #ifdef HAVE_DLFCN_H 49 # include <dlfcn.h> 50 #endif 51 52 #ifdef HAVE_FCNTL_H 53 # include <fcntl.h> 54 #endif 55 56 /// This function builds an error message into \p ErrMsg using the \p prefix 57 /// string and the Unix error number given by \p errnum. If errnum is -1, the 58 /// default then the value of errno is used. 59 /// @brief Make an error message 60 /// 61 /// If the error number can be converted to a string, it will be 62 /// separated from prefix by ": ". 63 static inline bool MakeErrMsg( 64 std::string* ErrMsg, const std::string& prefix, int errnum = -1) { 65 if (!ErrMsg) 66 return true; 67 if (errnum == -1) 68 errnum = errno; 69 *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum); 70 return true; 71 } 72 73 namespace llvm { 74 namespace sys { 75 76 /// Convert a struct timeval to a duration. Note that timeval can be used both 77 /// as a time point and a duration. Be sure to check what the input represents. toDuration(const struct timeval & TV)78inline std::chrono::microseconds toDuration(const struct timeval &TV) { 79 return std::chrono::seconds(TV.tv_sec) + 80 std::chrono::microseconds(TV.tv_usec); 81 } 82 83 /// Convert a time point to struct timespec. toTimeSpec(TimePoint<> TP)84inline struct timespec toTimeSpec(TimePoint<> TP) { 85 using namespace std::chrono; 86 87 struct timespec RetVal; 88 RetVal.tv_sec = toTimeT(TP); 89 RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count(); 90 return RetVal; 91 } 92 93 /// Convert a time point to struct timeval. toTimeVal(TimePoint<std::chrono::microseconds> TP)94inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) { 95 using namespace std::chrono; 96 97 struct timeval RetVal; 98 RetVal.tv_sec = toTimeT(TP); 99 RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count(); 100 return RetVal; 101 } 102 103 } // namespace sys 104 } // namespace llvm 105 106 #endif 107